GB2305872A - Low pressure spray gun - Google Patents

Low pressure spray gun Download PDF

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Publication number
GB2305872A
GB2305872A GB9520183A GB9520183A GB2305872A GB 2305872 A GB2305872 A GB 2305872A GB 9520183 A GB9520183 A GB 9520183A GB 9520183 A GB9520183 A GB 9520183A GB 2305872 A GB2305872 A GB 2305872A
Authority
GB
United Kingdom
Prior art keywords
low pressure
spray gun
pressure spray
nozzle
swirl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9520183A
Other versions
GB9520183D0 (en
Inventor
David James Short
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9520183A priority Critical patent/GB2305872A/en
Publication of GB9520183D0 publication Critical patent/GB9520183D0/en
Publication of GB2305872A publication Critical patent/GB2305872A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated

Landscapes

  • Nozzles (AREA)

Abstract

A low pressure spray gun has a self-cleaning needle valve 3,8-13, which is opened by compressed air supplied to chamber 21 via inlet 17, whereby fluid to be sprayed is drawn from inlet 18 towards the nozzle assembly 15,16. Atomising air enters inlet 20 and passes, via machining 19 (see also Fig 2), into angled passages 5 and thence to vortex chamber 6 where it entrains and breaks up the liquid on exiting the nozzle.

Description

Low Pressure Spray Gun This Invention relates to a low pressure, high volume spray gun.
Air atomizing spray guns are common and widely used within many environments. The atomizing air is mixed into the material being sprayed, either internally or externally of the spray gun. This causes the material to break up as it accelerates to its target, however this is not a very accurate means, as it causes overspray and airborne pollution.
According to the present invention, there is provided a low pressure spray gun, comprising of main body, swirl spray nozzle,operating air cap, and a means of balancing and swirling the atomizing air and material being sprayed. All parts when assembled form a smooth cylindrical body. All parts are assembled with screw threads for the ease of cleaning and maintenance.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 Shows in section the assembly of the spray gun Figure 2 Illustrates in part section with sections of the swirl spray nozzle and chamber.
Referring to the drawing, the spray gun comprises of a main body 14, spray nozzle assembly 15, 16, operating air cap 1, return spring 2, a self cleaning needle assembly 3, 8,9, 10, 11, , ? 12, 13, and a double seal assembly 7. When assembled they form a smooth cylindrical unit.
The principle of the low pressure spray is that the fluid enters the spray gun inlet 18, and passes down the centre chamber ; where it is sealed by the base of the needle 3 and the seat machined into the nozzle 15. When the gun is operated and compressed air enters the operating chamber 21 via the inlet 17 this is used to lift the needle valve assembly 3, 8, 9, 10, 11, 12, 13, and the product is mixed into the low pressure swirl atomising air caused by the nozzle assembly 15,16.
This gives a good and even displacement of air and fluid.
To produce this swirl, the atomising air must first be passed into the balance chamber via 20 through special machining 19, which causes a swirling action, this then is passed through the angled drill holes 5 to accelerate and direct the air. This causes a vortex within the air cap void 6, this in turn causes on exit of the nozzle, the fluid to swirl and break up into fine particles, that are directed by the low pressure air to its target, reducing overspray or airborne pollution.
The spray gun is designed to be easily cleanable or serviced, by the removal of the operating air cap 1. After removal of the operating air cap 1 and the spring 2, the moving parts assembly is easily removable 3, 8, 9, 10,11, 12,13, giving access to the seal assembly by removal of one nut 7. The nozzle assembly is fully removable, for cleaning. separating the needle from the needle seat.

Claims (1)

  1. Claims
    Claim 1 A low pressure spray gun, comprising of main body, swirl spray nozzle, operating air cap, and a means of balancing and swirling the atomizing air and material being sprayed.
    All parts when assembled form a smooth cylindrical body.
    All parts are assembled with screw threads for the ease of cleaning and maintenance.
    Claim 2 A low pressure spray gun as in claim 1 wherein the air flow is balanced and directed into a swirl to atomise the sprayed product.
    Claim 3 A low pressure spray gun as in claim 1 or claim 2, a removable swirl nozzle for cleaning. Separating the balance chamber and incorporating the seat for the needle valve in the base. Also allowing the base of the needle assembly to protrude through the nozzle orifice for self cleaning on each operation.
    Claim 4 A low pressure spray gun as in claim 1 claim 2 claim 3 an easy removable operating air cap, giving easy access to all moving parts and seals.
    Claim 5 A low pressure spray gun as in claim 1 or claim 2 or claim
    3 or claim 4, a needle valve assembly that seats in the base of the swirl spray nozzle. This is an air operated spring return, and can be removed quickly by removal of the operating air cap. With an extended needle end to protrude past the needle seat through the nozzle orifice.
    Amendments to the claims have been tiled as follows Claim 1 A low pressure spray gun, comprising of a main body, swirl spray nozzle, operating air cap and a means of balancing and swirling the atomizing air and material being sprayed.
    Claim 2 A low pressure spray gun as in Claim 1, wherein the air flow is balanced and directed into a swirl to atomise the sprayed product.
    Claim 3 A low pressure spray gun as in Claim 1 and Claim 2, wherein a removable swirl nozzle is provided to enable cleaning.
    Claim 4 A low pressure spray gun as in Claim 1, Claim 2 and Claim 3, wherein the removable swirl nozzle comprises a separated balance chamber.
    Claim 5 A low pressure spray gun as in Claim 1, Claim 2, Claim 3 and Claim 4, wherein the removable swirl nozzle incorporates the seat for a needle valve in its base.
    Claim 6 A low pressure spray gun as in Claim 1, Claim 2, Claim 3, Claim 4 and Claim 5, wherein the removable swirl nozzle allows for the base of the needle assembly to protrude through the nozzle orifice for self cleaning on each operation.
    Claim 7 A low pressure spray gun as in Claim 1, Claim 2, Claim 3, Claim 4, Claim 5 and Claim 6, wherein an easily removable operating air cap is provided, giving easy access to all moving parts and seals.
    Claim 8 A low pressure spray gun as in Claim 1, Claim 2, Claim 3, Claim 4, Claim 5 and Claim 6, wherein an air operated, spring return, needle valve assembly is provided, which seats in the base of the swirl nozzle, and which can be removed quickly by removal of the operating air cap, and incorporates an extended needle end to protrude past the needle seat through the nozzle orifice.
    Claim 9 A low pressure, high volume spray gun as claimed in any preceding claim, wherein all parts when assembled form a smooth cylindrical body.
    Claim 10 A low pressure, high volume spray gun as claimed in any preceding claim, wherein all parts are assembled with screw threads for the ease of cleaning and maintenance.
    Claim 11 A low pressure, high volume spray gun substantially as described herein with reference to figures 1 and 2 of the accompanying drawings.
GB9520183A 1995-10-03 1995-10-03 Low pressure spray gun Withdrawn GB2305872A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9520183A GB2305872A (en) 1995-10-03 1995-10-03 Low pressure spray gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9520183A GB2305872A (en) 1995-10-03 1995-10-03 Low pressure spray gun

Publications (2)

Publication Number Publication Date
GB9520183D0 GB9520183D0 (en) 1995-12-06
GB2305872A true GB2305872A (en) 1997-04-23

Family

ID=10781703

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9520183A Withdrawn GB2305872A (en) 1995-10-03 1995-10-03 Low pressure spray gun

Country Status (1)

Country Link
GB (1) GB2305872A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB440782A (en) * 1935-06-05 1936-01-06 William Robert Garner An improved atomizer for liquids
GB1149095A (en) * 1965-09-03 1969-04-16 Automation Industrielle Sa Improvements in or relating to spray guns
GB1374200A (en) * 1971-11-18 1974-11-20 Fisher Co Ltd L J Spray guns for viscous liquids
GB2054412A (en) * 1979-07-27 1981-02-18 Gen Motors Corp Air operated spray device
GB2148150A (en) * 1983-09-09 1985-05-30 Phoenix Engineering Company Li Spray nozzle
US4846404A (en) * 1988-01-29 1989-07-11 Graves Spray Supply, Inc. Internal mix spray gun cartridge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB440782A (en) * 1935-06-05 1936-01-06 William Robert Garner An improved atomizer for liquids
GB1149095A (en) * 1965-09-03 1969-04-16 Automation Industrielle Sa Improvements in or relating to spray guns
GB1374200A (en) * 1971-11-18 1974-11-20 Fisher Co Ltd L J Spray guns for viscous liquids
GB2054412A (en) * 1979-07-27 1981-02-18 Gen Motors Corp Air operated spray device
GB2148150A (en) * 1983-09-09 1985-05-30 Phoenix Engineering Company Li Spray nozzle
US4846404A (en) * 1988-01-29 1989-07-11 Graves Spray Supply, Inc. Internal mix spray gun cartridge

Also Published As

Publication number Publication date
GB9520183D0 (en) 1995-12-06

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)